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v3.25.3

General - Summary of Reclassifications to Amounts Previously Reported (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Costs and expenses: |  |  |  |
Interest expense | $ 1,261 | $ 1,214 | $ 3,771 | $ 3,760
Insurance and Other [Member] |  |  |  |
Revenues: |  |  |  |
Sales and service revenues | 51,011 | 49,453 | 148,484 | 151,227
Interest, dividend and other investment income | 5,697 | 5,928 | 17,331 | 15,550
Costs and expenses: |  |  |  |
Cost of sales and services | 40,875 | 39,579 | 119,042 | 122,453
Selling, general and administrative expenses | 6,285 | 8,219 | 21,897 | 19,793
Interest expense | 325 | 315 | 983 | 1,057
Railroad, Utilities and Energy [Member] |  |  |  |
Revenues: |  |  |  |
Utility and energy operating revenues | 6,046 | 6,014 | 16,658 | 16,350
Service revenues and other income | 1,274 | 1,345 | 3,467 | 3,821
Costs and expenses: |  |  |  |
Utility and energy cost of sales and other expenses | 4,578 | 4,456 | 12,825 | 12,849
Interest expense | $ 936 | 899 | $ 2,788 | 2,703
Previously Reported [Member] | Insurance and Other [Member] |  |  |  |
Revenues: |  |  |  |
Sales and service revenues |  | 38,863 |  | 115,227
Interest, dividend and other investment income |  | 5,896 |  | 15,450
Costs and expenses: |  |  |  |
Cost of sales and services |  | 30,323 |  | 90,109
Selling, general and administrative expenses |  | 7,324 |  | 17,292
Interest expense |  | 315 |  | 961
Previously Reported [Member] | Railroad, Utilities and Energy [Member] |  |  |  |
Revenues: |  |  |  |
Utility and energy operating revenues |  | 16,598 |  | 52,336
Service revenues and other income |  | 1,383 |  | 3,935
Costs and expenses: |  |  |  |
Utility and energy cost of sales and other expenses |  | 14,607 |  | 47,694
Interest expense |  | 899 |  | 2,799
Reclassification [Member] | Insurance and Other [Member] |  |  |  |
Revenues: |  |  |  |
Sales and service revenues |  | 10,590 |  | 36,000
Interest, dividend and other investment income |  | 32 |  | 100
Costs and expenses: |  |  |  |
Cost of sales and services |  | 9,256 |  | 32,344
Selling, general and administrative expenses |  | 895 |  | 2,501
Interest expense |  |  |  | 96
Reclassification [Member] | Railroad, Utilities and Energy [Member] |  |  |  |
Revenues: |  |  |  |
Utility and energy operating revenues |  | (10,584) |  | (35,986)
Service revenues and other income |  | (38) |  | (114)
Costs and expenses: |  |  |  |
Utility and energy cost of sales and other expenses |  | $ (10,151) |  | (34,845)
Interest expense |  |  |  | $ (96)

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